Abstract: The chemical composition of semi-steel after extracted-vanadium from hot metal with 4. 28% 〜5. 02% C and 0. 19% ~0. 24% V is 3. 30% - 3. 80% C and ≤0. 037% V. The “slag-remaining + double slag” process is remaining the slag of previous heat, charging extracted vanadium semi-steel and 50 ~ 70 kg/t scrap, adding lime and dolomite, blowing for 5 ~6 min, then tapping slag, adding suitable lime and dolomite and continuous blowing to end. Results show that in early blowing period, with increasing slag basicity or liquid temperature, the dephosphorization rate of liquid earlier increases and later decreases, and with increasing (FeO) in slag the dephosphorization rate of liquid earlier increases and later is constant, and the optimal control conditions are slag basicity 3.0 ~3.5 , (FeO) 10.0% ~ 15.0% and liquid temperature at tapping slag 1480 ~ 1 510 ℃； in later blowing period, with increasing slag basicity the dephosphorization rate increases, while with increasing liquid temperature the dephosphorization rate decreases, the effect of (FeO) on dephosphorization is similar to that in the earlier blowing period, it is available to control the slag basicity 3. 5 ~ 4.0, (FeO) 8.0% ~ 10.0% and liquid temperature ≤1 630 °C at BOF blowing end and the dephosphorization rate is more than 90.0% ； and the liquid end [P] shall be controlled less than 0. 015% to meet the requirement for low phosphorus steel steelmaking.

摘要： 4.28%5.02%C,0.19%0.24%V铁水经提钒后的半钢成分为3.30%~3.80%C,≤0.037%V。"留渣+双渣"法为留上一炉渣,兑入提钒半钢和50~70 kg/t废钢加入石灰和白云石进行吹炼56 min,倒渣,并加入适量石灰和白云石继续吹炼至终点。结果表明,吹炼前期随着炉渣碱度或温度的增加,钢水脱磷率先增加后降低,而随着渣中（FeO）增加脱磷率先增加后稳定,前期最佳控制条件为炉渣碱度3.0~3.5,（FeO）10.0%~15.0%,倒渣温度1 480~1 510℃;转炉吹炼后期,随着炉渣碱度的增加脱磷率升高,而随着温度的增加脱磷率降低,（FeO）对脱磷率的影响与前期较为相近,转炉吹炼终点控制碱度3.5~4.0,（FeO）8.0%~10.0%,温度≤1630℃为宜,脱磷率在90.0%以上;此工艺可将钢水终点[P]控制在0.015%以内,满足低磷钢冶炼的需求。

关键词: 100t转炉, 提钒半钢, 低磷钢, 炉渣成分, 温度控制, 留渣+双渣法